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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM2660M

Name: LM2660M
Brand: Texas Instruments
SKU: LM2660M
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2660M

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LM2660M.pdf

Description:: IC REG CHRG PUMP INV 100MA 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM2660M from Texas Instruments is a CMOS switched-capacitor voltage converter configured as an unregulated inverter or doubler, operating from 1.5 V to 5.5 V input, delivering up to 100 mA output current with 6.5 Ω typical output resistance and 88% conversion efficiency at full load - used in portable medical instruments requiring compact negative rail generation.

For engineers reviewing the LM2660M datasheet, LM2660M pinout, LM2660M application, or LM2660M equivalent, key selection criteria include oscillator frequency selectability (10 kHz/80 kHz), LV pin low-voltage enable logic, dual-mode operation (inverter/doubler), and SOIC-8 package compatibility with legacy LMC7660 designs.

Technical Context

The LM2660M implements a four-switch charge-pump topology with internal CMOS switches driven by a programmable oscillator. Its FC pin selects between 10 kHz and 80 kHz nominal oscillator frequency, directly determining switching frequency (f_SW = f_OSC/2) and impacting output resistance and ripple performance.

In inverter mode, it generates −V_IN at OUT using external flying (CAP+/CAP−) and output (C_OUT) capacitors; in doubler mode, GND becomes input and V+ becomes output, requiring LV tied to OUT and disabling external OSC clocking - both modes rely on capacitor ESR and switch R_ON for effective output impedance.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	1.5 V to 5.5 V - supports single-cell Li-ion, alkaline, or NiMH battery inputs without external regulation.
Oscillator Frequency	10 kHz or 80 kHz (FC-pin selectable) - higher frequency enables smaller external capacitors and lower output impedance.
Output Current	100 mA max - sufficient for biasing op-amps, RS-232 transceivers, or LCD contrast supplies.
Output Resistance	6.5 Ω typical at 100 mA - defines voltage drop under load; reduced further by paralleling multiple LM2660M units.
Conversion Efficiency	88% typical at 100 mA - minimizes quiescent current (120 µA) and thermal rise in space-constrained battery systems.
Package	SOIC-8 (4.90 mm × 3.91 mm) - industry-standard footprint compatible with automated assembly and legacy LMC7660 layouts.

Pinout & Package

LM2660M is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 4.90 mm × 3.91 mm body size, and Pb-free SN lead finish rated MSL Level-1 (unlimited floor life).

Pin/Terminal	Circuit Role	Design Meaning
1 FC	Oscillator frequency control	Open = 10 kHz; tied to V+ = 80 kHz; no effect when OSC driven externally (inverter mode only).
2 CAP+	Flying capacitor positive terminal	Connects to positive plate of charge-transfer capacitor C1; critical path for high-current switching transitions.
3 GND	Power ground reference	Common return for supply, output, and internal oscillator; must be low-inductance connection to minimize noise.
4 CAP−	Flying capacitor negative terminal	Connects to negative plate of C1; forms charge-transfer loop with CAP+ during switching phases.
5 OUT	Inverter output / Doubler ground	In inverter mode: negative output rail; in doubler mode: tied to system ground - not interchangeable across modes.
6 LV	Low-voltage enable	Tied to GND for V_IN < 3.5 V; open or GND for V_IN ≥ 3.5 V; must be tied to OUT in doubler mode.
7 OSC	Oscillator control	Internal 15 pF node; accepts external capacitor for frequency reduction or external CMOS clock ≤150 kHz (inverter only).
8 V+	Positive supply input / Doubler output	In inverter mode: input rail; in doubler mode: positive output rail - pin function changes with configuration.

Key Features

Feature	Design Value
Dual-mode operation	Configurable as inverter (−V_IN) or doubler (+2V_IN) via external pin wiring - eliminates need for separate part numbers.
Low quiescent current	120 µA typical - extends battery life in always-on portable instrumentation without sacrificing output capability.
Parallel operation support	Multiple LM2660M units can share one output capacitor while using individual flying capacitors - scales output current without redesign.
External clock synchronization	OSC pin accepts external CMOS clock up to 150 kHz in inverter mode - enables EMI reduction via spread-spectrum or system-clock locking.
LV pin optimization	LV pin bypasses internal regulator below 3.5 V - maintains efficiency and start-up reliability across wide battery discharge range.

Applications

Operational Amplifier Power Supplies	Handheld Medical Instruments
Use Scenario: Generating dual-rail ±5 V supplies for precision op-amps in portable ECG front-ends. IC Role / Device Role / Timing Role: LM2660M acts as negative rail generator, inverting +5 V to −5 V using ceramic flying and output capacitors. Use Value: Eliminates inductors and reduces board area by >40% vs. inductor-based inverters while maintaining <10 mV ripple at 50 mA load.	Use Scenario: Providing isolated negative bias for photodiode transimpedance amplifiers in battery-powered pulse oximeters. IC Role / Device Role / Timing Role: LM2660M operates in inverter mode with FC = open (10 kHz) to minimize EMI near sensitive analog signal paths. Use Value: Achieves 88% efficiency at 20 mA load, extending AA battery life to >120 hours without thermal derating.
Laptop Peripheral Interfaces	RS-232 Transceiver Bias
Use Scenario: Supplying −3 V to +3 V interface rails for USB-to-serial bridge ICs in ultraportable docking stations. IC Role / Device Role / Timing Role: LM2660M configured as doubler (V_IN = +3.3 V → V_OUT = +6.6 V), followed by linear regulator for clean ±3 V. Use Value: Enables use of single 3.3 V rail instead of dual-input power management IC, reducing BOM count by two components.	Use Scenario: Generating ±12 V bias for legacy RS-232 line drivers in industrial handheld terminals. IC Role / Device Role / Timing Role: LM2660M cascaded in triple-inverter configuration (three units) to produce −12 V from +4 V LiPo battery. Use Value: Delivers regulated −12 V at 15 mA with <5% voltage droop across temperature, meeting TIA-232-F spec without transformer isolation.

Operational Amplifier Power Supplies

Handheld Medical Instruments

Use Scenario: Generating dual-rail ±5 V supplies for precision op-amps in portable ECG front-ends.

IC Role / Device Role / Timing Role: LM2660M acts as negative rail generator, inverting +5 V to −5 V using ceramic flying and output capacitors.

Use Value: Eliminates inductors and reduces board area by >40% vs. inductor-based inverters while maintaining <10 mV ripple at 50 mA load.

Use Scenario: Providing isolated negative bias for photodiode transimpedance amplifiers in battery-powered pulse oximeters.

IC Role / Device Role / Timing Role: LM2660M operates in inverter mode with FC = open (10 kHz) to minimize EMI near sensitive analog signal paths.

Use Value: Achieves 88% efficiency at 20 mA load, extending AA battery life to >120 hours without thermal derating.

Laptop Peripheral Interfaces

RS-232 Transceiver Bias

Use Scenario: Supplying −3 V to +3 V interface rails for USB-to-serial bridge ICs in ultraportable docking stations.

IC Role / Device Role / Timing Role: LM2660M configured as doubler (V_IN = +3.3 V → V_OUT = +6.6 V), followed by linear regulator for clean ±3 V.

Use Value: Enables use of single 3.3 V rail instead of dual-input power management IC, reducing BOM count by two components.

Use Scenario: Generating ±12 V bias for legacy RS-232 line drivers in industrial handheld terminals.

IC Role / Device Role / Timing Role: LM2660M cascaded in triple-inverter configuration (three units) to produce −12 V from +4 V LiPo battery.

Use Value: Delivers regulated −12 V at 15 mA with <5% voltage droop across temperature, meeting TIA-232-F spec without transformer isolation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LMC7660IM/NOPB	Same SOIC-8 footprint, but fixed 10 kHz oscillator and no FC/OSC pins; 100 µA I_Q, 10 Ω R_OUT.	Not configurable for 80 kHz or external clock; limited to inverter mode only - no doubler capability.	Select when cost sensitivity outweighs frequency flexibility and dual-mode needs.
MAX680CPA+	SOIC-8, 100 kHz oscillator, 120 mA I_OUT, 4 Ω R_OUT; requires no LV pin, wider 2.0–6.0 V input range.	Higher frequency enables smaller capacitors; lacks LV pin logic - less optimized for sub-3.5 V battery start-up.	Select when higher output current and lower output impedance are prioritized over ultra-low I_Q and low-voltage enable.

Compared with LMC7660IM/NOPB, LM2660M adds frequency selectability and doubler mode at slight I_Q increase; versus MAX680CPA+, LM2660M offers superior low-voltage start-up (1.5 V) and integrated LV control but trades 20 mA output headroom.

Availability

LM2660M is available at Aetrix Electronics and suitable for portable medical instruments, handheld test equipment, and RS-232 interface power supplies requiring stable component supply and long-term production continuity.

Supply support for LM2660M includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with broad industrial and automotive portfolio coverage.

The LM2660M belongs to TI's legacy switched-capacitor converter product line, designed specifically for low-noise, inductorless DC/DC voltage inversion and doubling in space- and cost-constrained portable electronics.

FAQ

What is the minimum input voltage required for reliable startup of the LM2660M?

The LM2660M supports startup down to 1.5 V when the LV pin is tied to GND - this bypasses internal regulation circuitry and ensures oscillator activation even with deeply discharged batteries. At input voltages above 3.5 V, LV may be left open or grounded without affecting functionality. Startup behavior is verified per TI SNVS135E Section 6.3 Recommended Operating Conditions.

Can the LM2660M be used to generate a regulated negative output voltage?

Yes, the LM2660M can feed a low-dropout linear regulator such as the LP2951 to produce a regulated negative output. TI Application Note SNVS135E Figure 20 shows this configuration generating −1.5 V to −5.5 V from the LM2660M's unregulated inverter output. The LM2660M itself provides only unregulated inversion or doubling; regulation requires external circuitry.

Does the LM2660M support external clock synchronization, and what are the limits?

The LM2660M supports external clock synchronization only in inverter mode via the OSC pin, accepting CMOS-level signals swinging within 100 mV of V+ and GND, up to 150 kHz maximum frequency. The LV pin must be tied to GND during external clocking. This feature is disabled in doubler mode per TI SNVS135E Section 8.3.1 and Table 1.

What is the role of the LV pin in LM2660M voltage doubler configuration?

In LM2660M voltage doubler configuration, the LV pin must be connected to the OUT pin - which serves as system ground in that mode - to ensure proper internal oscillator biasing and prevent latch-up. This differs from inverter mode, where LV is either grounded or left open. Failure to tie LV to OUT in doubler mode results in oscillator failure and no output regulation.

How does paralleling multiple LM2660M units affect output resistance and thermal performance?

Paralleling N LM2660M units reduces composite output resistance to R_OUT/N, as each unit contributes its own switch R_ON and capacitor ESR in parallel. Thermal performance improves due to current sharing, but each unit requires its own flying capacitor (C1) and shared output capacitor (C_OUT). TI SNVS135E Section 9.2.1.2.2 confirms this scaling applies across temperature and load conditions.

LM2660M Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Function:: Ratiometric

Output Configuration:: Positive or Negative

Topology:: Charge Pump

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 1.5V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: -Vin, 2Vin, Vin/2

Voltage - Output (Max):: -

Current - Output:: 100mA

Frequency - Switching:: 5kHz, 40kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 85°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

LM2660M FAQ

1.How can I place an order for LM2660M through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2660M on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM2660M reliable?

The price and inventory of LM2660M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2660M is usually 5 days.

3.What payment methods are accepted for LM2660M?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2660M transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2660M?

LM2660M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2660M order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM2660M?

For technical support, including LM2660M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2660M requirements.

6.How does Aetrix verify that LM2660M is sourced from the original manufacturer or authorized distributors?

All LM2660M products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2660M meets industry standards.

7.What is the process for return or replacement of LM2660M?

All LM2660M units undergo pre-shipment inspection (PSI). If there is an issue with LM2660M, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM2660M part is unused and in its original packaging.

Return procedure for LM2660M:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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